Incandescent lamp



A ril 25, 1933. E. c. SMALLY INCANDESCENT LAMP Filed March 11, 1931 m n We E C. Smally Patented Apr. 25, 1933 PATENT OFFICE EMANUEL C. SMALLY, OF CANTON, OHIO INCANDESCENT LAMP RElSSUED Application filed March 11, 1931. Serial No. 521,645.

The invention relates to incandescent electric lamp bulbs and more particularly to a bulb having a replaceable filament, and having a reflector incorporated therewith, whereby the capacity of the lamp for illumination is materially increased.

'An object of the improvement is to provide an incandescent lamp provided with a socket arranged to detachably receive a plug or base carrying the filament.

Another object is to provide an incandescent lamp having a reflector incorporated therein and forming the rear portion of the lamp bulb.

A further object is to provide an incandescent lamp in which a portion of the bulb may be removed to remove a burned out filament and to replace the same with a new filament or with a small bulb.

The above and other objects may be attained by constructing the improved incandescent lamp in the manner illustrated in the accompanying drawing, in which Figure 1 is a longitudinal sectional view of the improved incandescent lamp showing the manner of detachably mounting the filament therein; and m Fig. 2, a similar view showing the filament replaced by a small bulb."

Similar numerals refer to similar parts throughout the drawing.

The improved incandescent lamp to which the invention pertains may include a reflector 10 preferably slightly concaved, as shown in the drawing, and adapted to form the rear portion of the lamp bulb, a glass globe 11 being detachably connected to the peripheral portion of the reflector, the joint between the reflector and glass globe being sealed with any suitable material to provide an air-tight joint whereby a vacuum may be maintained within the globe or suitable gas may be contained therein as is customary in ordinary practice.

' In order to connect the glass globe to the reflector, a peripheral groove or channel 12 may be formed upon the reflector to receive the edge portion ofthe globe, any suitable sealing material such as indicated at 13 be ing used for providing an airtight joint.

The central portion of the reflector may be secured to the insulation base 14 provided with the usual screw threaded shell 15 adapted to be inserted into the usual lamp socket. The inner end portion of the insulation base 14 is provided with a socket within which may be fixed a screw threaded tubular metal member 16 electrically connected with the shell 15, as shown at 17.

Within the bottom of this socket is pro- 50 vided a contact point 18, insulated from the tubular metal member 16 and electrically connected with the usual contact 19, at theend of the base 14, as shown at 20.

The filament 21 is adapted to be carried by a small base 22 surrounded by a screw threaded metal shell 23 adapted to be-received in the threaded tubular member 16 located in the socket of the base 14:. One end of the filament is electrically connected to the shell 23 as shown at 24, the other end thereof being connected to the contact 25 which contacts with the contact 18, thus completing the circuit through the filament when the base 14 is screwed into a lamp socket.

When the filament 21 burns out it may be replaced by a new filament by removing the glass globe 11 from the reflector 10 and after the new filament has been inserted the globe 11 is replaced upon the reflector and sealed, the air being exhausted from the globe, which, if desired, may then be filled with a suitable gas as in ordinary practice.

If desired, the user may himself repair the lamp without returning it to the factory for insertion of a new filament as above described. This may be done by removing the glass globe 11 from the reflector and remov ing the filament, a small bulb of any usual and well known design, as shown generally at 26. being inserted into the socket of the base 14, after which the glass globe 11 may bFe replaced upon the reflector 10, as shown in lVith a lamp of this construction an increased lighting capacity is obtained with the consumption of a small amount of current. Vhile such lamps may be used for any purpose for which incandescent lamps are adaptable, they are especially advantageous for use in electric signs. For such purpose it will be seen that the reflector being entirely enclosed and protected from the elements, as well as from dirt and dust, the efiiciency of the lamp will not be impaired by long use out of doors.

I claim:

1. An incandescent lamp of the character described, comprising a base filled with insulation having a socket at its inner end, a reflector fixedly andcentrally securedyithin said insulation provided with a peripheral groove, 0. glass globe mounted within said groove and adapted to be sealed within the groove to provide an air-tight joint, and a filament detachably disposed within said 2. An incandescent lamp of, the character described, comprising a base filled with insulation having asocket at its inner end, a saucer-shaped reflector centrally and fixedly securedhwitlliin said insullatioriizlpil'gvided with a perip er groove, a-gass 0 connected within the groove and adapted to be sealed therein to provide an air-tight joint, and a filament detachably disposed within said socket and extending within the globe.

3. An incandescent lamp of the character described comprising a base filled with insulation iormed with a socket at its inner end, a dished reflector fixedly and centrally secured within the insulation provided with a peripheral groove around its peripheral portion and an upright rim, a glass globe detachably mounted within said groove and adapted to be sealed in the groove, and a filament detachably connected to the base wlitllin said socket and extending within the g 4. An incandescent lamp of the character described, comprising a base filled with insul'ation a reflector centrally and fixedly secured within the insulation provided with a groove around its peripheral portion and an upright rim formation, a glass globe detachablymounted within said groove and rim adapted to be sealed therein at its peripheral edge, and an incandescent bulb detachably connected to the base and extending within the globe.

5. An incandescent lamp of the character described, comprising a base filled with insulation formed with a socket at its inner end, a reflector carried by the base, and provided with a peripheral groove around its peripheral portion and an upright rim, a glass globe detachably mounted within said groove adapted to be sealed at its peripheral edge, an'd an incandescent bulb detachably connected to the base and extending within the globe.

In testimony that I claim the above, I have hereunto subscribed my name.

EMANUEL C. SMALLY. 

